This function returns the error code set by the failure of a Presentation Manager function.

#define INCL_WINERRORS /* Or use INCL_WIN, INCL_PM, */
#include <os2.h>

HAB        hab;             /*  Anchor-block handle. */
ERRORID    erridErrorCode;  /*  Last error code. */

erridErrorCode = WinGetLastError(hab);